Sadly, in real life, Gail Fisher became a drug addict after Mannix (1967) was completed, which contributed to her death in 2000.
Peggy-centric. Mannix is barely in it, he's pretty much a background player here, safe for a couple tiny appearances, here and there.
Leonard Stone and Gloria Manon both appeared in "Willy Wonka and the Chocolate Factory" a little over a year prior to this episode's air date.